Work

Equine neuroborreliosis in Scandinavia: cerebrospinal fluid PCR confirmation and successful treatment in a mare

Year: 2026

Type: article

Abstract: BACKGROUND: Lyme borreliosis (LB), caused by Borrelia burgdorferi sensu lato, is an emerging concern in human medicine, and is a controversial topic in equine medicine. Neuroborreliosis (NB), a neurologic manifestation of LB, remains challenging to diagnose due to nonspecific clinical signs and the lack of definitive diagnostic methods. This report describes the first documented case of equine NB in Scandinavia. CASE PRESENTATION: An 11-year-old mare presented with progressive weight loss, ataxia, muscle atrophy, and hyperesthesia. Cerebrospinal fluid (CSF) analysis revealed neutrophilic pleocytosis, elevated protein and a positive PCR result for Borrelia spp. The mare showed clinical improvement and long-term recovery following prolonged doxycycline therapy. CONCLUSIONS: This case is the first reported case of neuroborreliosis in a horse in Scandinavia and supports the diagnostic relevance of CSF PCR in conjunction with clinical and cytological findings. It also underscores the potential for recovery in equine NB when early antimicrobial treatment is initiated.

Source: Acta veterinaria Scandinavica

DOI: 10.1186/s13028-026-00879-0

Authors: Sofia Ruiz, Marianne Øverlie, Amanda Bergren, Ingunn Risnes Hellings

Institution: Norwegian University of Life Sciences

Language: English

Topic: Vector-borne infectious diseases

Subfield: Parasitology

Field: Immunology and Microbiology

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $2,990